package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.IdWorker;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.entity.*;
import com.itheima.reggie.mapper.OrderMapper;
import com.itheima.reggie.service.*;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;

@Service
public class OrderServiceImpl extends ServiceImpl<OrderMapper, Orders> implements OrderService {
    @Autowired
    private ShoppingCartService shoppingCartService;
    @Autowired
    private UserService userService;
    @Autowired
    private AddressBookService addressBookService;
    @Autowired
    private OrderDetailService orderDetailService;

    /**
     * A. 获得当前用户id, 查询当前用户的购物车数据
     * B. 根据当前登录用户id, 查询用户数据
     * C. 根据地址ID, 查询地址数据
     * D. 组装订单明细数据, 批量保存订单明细
     * E. 组装订单数据, 批量保存订单数据
     * F. 删除当前用户的购物车列表数据
     *
     * @param orders
     */
    @Override
    @Transactional // 开启事务
    public void submit(Orders orders) {
        // 获取当前用户Id
        Long userId = BaseContext.getCurrentId();

        // 查询当前用户的购物车数据
        LambdaQueryWrapper<ShoppingCart> lam1 = new LambdaQueryWrapper<>();
        lam1.eq(ShoppingCart::getUserId, userId);
        List<ShoppingCart> shoppingCarts = shoppingCartService.list(lam1);
        if (shoppingCarts == null || shoppingCarts.size() == 0) {
            throw new CustomException("购物车不能为空,不能下单");
        }

        // 查询用户数据
        User user = userService.getById(userId);

        // 查询地址数据
        Long addressBookId = orders.getAddressBookId();
        AddressBook addressBook = addressBookService.getById(addressBookId);
        if (addressBook == null) {
            throw new CustomException("用户地址信息有误 不能下单");
        }
        /**
         *
         com.baomidou.mybatisplus.core.toolkit.IdWorker是MyBatis-Plus框架中的一个工具类，用于生成唯一的ID。它提供了一种简单而高效的方式来生成全局唯一的ID，可以用于数据库表的主键等场景。
         */
        Long orderId = IdWorker.getId();// 订单号

        AtomicInteger atomicInteger = new AtomicInteger(0);
        // 组装订单明细
        List<OrderDetail> orderDetails = shoppingCarts.stream().map((item)->{
            OrderDetail orderDetail = new OrderDetail();
            orderDetail.setOrderId(orderId);
            orderDetail.setDishId(item.getDishId());
            orderDetail.setNumber(item.getNumber());
            orderDetail.setDishFlavor(item.getDishFlavor());
            orderDetail.setSetmealId(item.getSetmealId());
            orderDetail.setName(item.getName());
            orderDetail.setImage(item.getImage());
            orderDetail.setAmount(item.getAmount());
            atomicInteger.addAndGet(item.getAmount().multiply(new BigDecimal(item.getNumber())).intValue());
            return orderDetail;
        }).collect(Collectors.toList());
        // 组装订单数据
        orders.setId(orderId);
        orders.setOrderTime(LocalDateTime.now());
        orders.setCheckoutTime(LocalDateTime.now());
        orders.setStatus(2);
        orders.setAmount(new BigDecimal(atomicInteger.get()));
        orders.setUserId(userId);
        orders.setNumber(String.valueOf(orderId));
        orders.setConsignee(addressBook.getConsignee());
        orders.setPhone(addressBook.getPhone());
        orders.setAddress(addressBook.getProvinceName()==null?"":addressBook.getProvinceName()
        + addressBook.getCityName()==null?"":addressBook.getCityName()
        +addressBook.getDistrictName()==null?"":addressBook.getDistrictName()
        +addressBook.getDetail()==null?"":addressBook.getDetail());
        this.save(orders);
        // 向订单明细表插入数据 多条数据
        orderDetailService.saveBatch(orderDetails);
        shoppingCartService.remove(lam1);
    }
}
